Is the Amazon Prime AMEX card considered the same as a Delta or Hilton...etc., in terms of their co-branded status and would be considered the same as those in terms of the 5-card limit? Hope that makes sense. I seen to recall there were degrees of AMEX co-branded cards; that some just had the "AMEX" name on it but weren't fully partnered with them or something to that effect. But then again, my recall isn't total. More like "barely".